利用辽宁省35个气象观测站点1956-2005年的逐月地面观测资料,对辽宁省近50年的农业气候条件的长期变化情况和空间分布特征进行了详细的分析,并初步分析了农业气候条件的变化对农业生产的影响.结果表明:近50年辽宁省生长季(4-9月)日照时数明显减少,每10年减少29.4 h;生长季日照百分率减少也很明显,平均每10年减少1.2%;生长季降水量呈微弱的减少趋势,蒸发量明显减少,平均每10年减少17.3 mm.潜在蒸发量也呈明显的减少趋势.生长季≥lO℃界限温度的积温值在近50年明显增加,且全省≥10℃界限温度开始的日期明显提前,大部分地区近50年提前6 d左右.辽宁省生长季3 350℃积温等值线在最近的10年里有明显的北移和东移.%Based on monthly ground observation data of 35 meteorological observation stations in 1956-2005, long-term changes and spatial distribution characteristics of agro-climatic conditions in the past 50 years in Liaoning Province are analyzed in detail, and the effect of agro-climatic conditions on agricultural production is preliminarily discussed. The result shows that; In the past 50 years, sunshine hours of growing season (April to September) has greatly decreased, with the amount of 29.4 hr/10a; percentage of sunshine of growth season has also reduced significantly, with an average reduction of 1. 2% per 10a; precipitation of growing season decreased weakly, while evaporation of growing season decreased byl7. 33 mm for every 10 years. Potential evaporation is also significantly reduced. Accumulated temperature of ≥10℃ threshold temperature of growth season has greatly increased in recent 50 years, and the starting date of ≥10℃threshold temperature has significantly brought forward, about 6 days in most areas. Growing season 3 350℃ accumulated temperature contour has marked northward and eastward shifts in these 10 years in Liaoning province.
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